Carburetor



Aug. 6, 1935. H. H. TIMIAN CARBURETOR Filed Nov. l2, 1952 4 Sheets-Sheet l Aug. s, 1935. H HTMAN- Y 2,010,206

CARBURETOR Filed Nov. l2, 1932 4 Sheets-Sheet 2 H. H. TIMIAN CARBURETOR Filed Nov. 12, 1932 4 Sheets-Sheet 5 INVENTOR. Ha'oZdH-'m an ATTORNEY.

H. H. TIMIAN CARBURETOR Filed Nov. l2, 1952 4 Sheets-Sheet 4 INVENTOR. zroZfZHqz'm an l l l ATTORNEY.

" performance.

Patented Aug. 6, 1935 CARBURETOR Hards n. frimian, permit, Mich., assigner to Continental Motors Corporation, Detroit, Mich., va corporation of VirginiaY Application November l2, 1932, Serial No. 642,353

, 6 claims. (olf 261-52) yMy invention relates to oarburetors and more particularly to means for controlling the throttle valve and mixture of a carburetor associated with a. hydrocarbon motor.

Heretofore it has been `customary to provide a vsingle control for the throttle valvevof the engine and a separate `control for the choke valve of the Acarburetor most generally employed to facilitate starting of the engine.v

tion of the engine, it is customary'to provide an additional throttle valve control (usually a hand device) which can be actuated when desired to partially open the carburetor throttle valve to facilitate engine starting or road speed settings.

It hasbeen proposed to provide means for interconnecting thethrottle and choke valves of a carburetor so as to progressively open the throttle Valve as the Choke valve is closed, but with such' devices, it is found that in most cases the throttle valve is opened an excessive amount when the choke valve is fully closed resulting in waste of fuel and racing of the engineV on starting. 4The speeding up of an engine after starting is usually desirable soqasto more quickly obtain a uniform distribution of the fuel mixture and more particularly it is desirable to quickly sweep outwet fuel accumulations in the manifold after starting the engine to obtain the desired efficient engine The speeding up ofthe engine subsequent to engine starting will effect this result but with `engines of the aforesaid type `it is necessary to open the choke valve by meansfof one `control device andto adjust` thethrottle valve by means of asecond control. be noted that efficient engineV performance on starting is 'largely dependent on the "skill of the operator and excessive amounts of lfuel are usu- 'i ally consumed instarting the engineas aresult of carburetor flooding by improperor inaccurate manipulation ofthe above controls. ln addition such improper manipulation of the controls often Y dependent on the skill of the operatonoperation y Because thev throttle valve is usually adjusted for idling opera- It will thus of the engine under destructive ally results. s l. I

By employing a carburetor with interconnected throttle andchoke valves, engine starting is materially facilitated due to the fact that the throtconditions us'u However, many Ydifficulties have'arisenin connection with carburetors of the aforesaid type. The connections between the throttle an'dvchoke valves result in an operation in which thethrotfl tle valve is progressively closedv on opening the choke valve subsequent to startingof the engine; and consequently4 the engine is frequently killed because of insuliicient throttle valve opening' which does not permit the supplying of a sufficient amount of fuel mixture to the engine. It becomes necessary to quickly'o'pen the 'throttle Valve by means of the foot accelerator pedal which operation generally results lin racing of the enginawaste of fuel, crankcase dilution and op? Ltle valve 'isfopened as the choke valve'is closed.

eration of the 'engine :under'destructive condil' tions. Y

An object of my present invention is to in if prove engine performance by providing a control for the throttlevalve'andi-mixture of the car--V buretor whereby` engine starting is facilitated and the engine performance is improved without the difficulties heretofore encountered.

Another object of Y my invention resides in ,facilitating engine start-ing and in generally iinproving engine performance byproviding a car-L ticular to effect a closing of the throttle valve in thedirection of its idling position onY closing the choke valve and vice-versa to effectfa` partial opening `of'said throttle valve on opening thel choke valve for sweeping out Wetfuel accumula-f` tions in the manifold subsequent to-engine start-` ing with a minimumof fuel consumption.

Other features of my present invention relate"V to a carburetor and the improved means for operatively connecting the throttle valve and choke valve to a single hand device whereby to control;rv the aforesaid valve adjustments, 'and further-I' contemplate the construction of *a hand-'device control andassooiated valve actuating connections whereby a relatively rapid actuation of the choke valve is obtained by employing a motion multiply'- ing device in conjunction with the connections between the hand device and the choke valve.

A further object of my invention is'to construct an improved compact controlling means forthei throttle valve and choke valve of a carburetor motion multiplying devices by providing a single hand device operable to adjust said valves and arranged solely to adjust the throttle valve during the rst part of its movement and to adjust both the throttle and choke valves during the latter part of its movement.

For a more detailed understanding of my invention, reference may be had to the accompanying drawings which illustrate preferred embodiments which my invention may assume, and in which:

Fig. 1 is a side elevational View of an engine and a portion of the associated vehicle illustrating the means for controlling the engine carburetor,

Fig. 2 is an enlarged side elevational view of the carburetor illustrating a means for controlling the operation of the carburetor throttle and choke Valves,

Fig. 3 is an end elevational View of the carburetor shown in Fig. 2 as seen from the right of Fig. 2,

Fig. 4 is an enlarged detail View of the interconnected valve operating devices showing the throttle valve in idling position and the choke valve open,

Fig. 5 is a similar detail View showing the throttle valve opened by means of the foot accelerator pedal,

Fig. 6 is a similar detail view showing the throttle valve opened by the hand device and illustrating the parts relatively positioned for the beginning of the choke valve operation,

Fig- 7 is a similar detail View showing the choke valve closed and the throttle valve partially closed towards idling position for starting the motor,

Fig. 8 is an enlarged detail view of the carburetor connections incorporated with a modied form of construction giving a relatively rapid choke valve operation by employment of modied intermediate the actuating element and choke valve, the throttle valve being adjusted in idling position.

Fig. 9 is an enlarged detail view of the modied showing of Fig. 8 and illustrating the independent operation of the throttle valve by means of the foot accelerating pedal,

Fig. 10 is a similar detail view showing the operation of the throttle valve by means of the hand device,

Fig. 11 is a similar detail View showing the y choke valve closed and the throttle valve adjusted for engine starting,

Fig. 12 is an enlarged detail view of a further modified construction, this view showing the choke ,valve open and the throttle valve adjusted in mounted for operation in the usual manner witha vehicle C, the engine being Vsupported. by the chassis D in any suitable manner. The engine herein illustrated is constructed in the usual manner and comprises in general an engine block I0 f and with the usual intake and exhaust manifolds II and I2 respectively, said intake manifold including the usual primary fuel mixture conducting portion I 3 adapted for connection with the fuel mixture outlet of carburetor A.

The carburetor A is provided with the usual adjustable throttle valve I4 for controlling the fuel mixture flow from the carburetor to the intake manifold, and the usual adjustable choke valve I5 for controlling the supply of air to the carburetor.

My present improvement relates more particularly to means for controlling the aforesaid carburetor throttle and choke valves I4 and I5 respectively, my improvement providing interconnected valve actuating devices operable from a single hand device or pull button I6, the latter being connected to an actuating element I8 by means of a Bowden wire I1, said element being connected with the throttle valve and choke valve of the carburetor whereby adjustment of said valves can be readily obtained as will be hereinafter explained.

One embodiment of my invention is shown in Figs. 1 to 7 inclusive. It will be noted that the throttle valve I4 is carried by a shaft I9 and the choke valve I5 is carried by the shaft 20. The throttle valve is urged to a closed position by means of a suitable spring or other yielding device 2I and the choke valve is urged to an open position by a spring or other yielding device 22. A throttle lever 23 is mounted on the shaft I9 and is adapted to be actuated for adjusting the throttle valve I 4. This throttle lever 23 may be actuated by means of a foot pedal 24 and suitable connections consisting of a bell crank 25 and a pull rod or Bowden wire 26 which is connected with the free end of the lever 23. In Fig. 4 the valves are adjusted and in particular the throttle valve for idling operation of the engine and the engine speed is controlled preferably during normal running operation by means of the foot pedal 24, which when actuated moves the throttle lever 23 into the position shown in Fig, 5. Fig. 5 of course shows the throttle wide open and it may be readily understood that the normal control of engine operation may be varied by adjusting the positions of the throttle valve as desired.

The actuating element I8 is preferably mounted for free rotation on the choke valve shaft 2D, and in the construction shown, this actuating element is provided with an ear or arm I 8 to which may be connected with a link 21, this link extending in the direction of the throttle valve and having an enlarged portion 28 adjacent its upper end which is provided with an arcuate slot 29. The throttle lever 23 is provided with an arm 3B carrying a pin 3| which is adapted to engage in the slot 29. It will be noted that when the throttle valve is operated by means of the foot pedal that the pin 3| will freely move in the arcuate slot 29 without affecting any movement of the lever 21. However, when the hand device is operated for actuating the actuating element I8 these links 21 are moved and by reason of the pin connection 3l with the throttle lever the throttle lever is then caused to be moved. It will be noted that the movement of the actuating element I8 from the position shown in Fig. 4 to that shown in Fig. 6 will cause the link 21 to move downwardly and thus partially open the throttle valve M. Further movement of the actuating element I8 from the position shown in Fig. 6 to that shown in Fig. '1 causes a movement upwardly of the link 21 and causes the throttle valve to move towards its idling posi-; The aforesaid movement to link,

The `position of the throttlevalve shown in 7 is. that which is most suitable for starting. the

engine. f

operationof the choke valve iscarried out` during the latter portion of the movement.v or `actuation vof the hand device |56. Ak lever ory y member32' isz. fixed to: the shat 2B lwhich carries.

the choke valve, and the outer end of this member 32 carries apin 33 which operates in a slot.-

34 of a-link 35, this link being connected to the link 21 by a pivot` joint 3B. The slot 34 permits relative movement of the link 35 and the arm 32 carried by the choke valve shaft. 20, and this link v35 positioned. so as to be engaged by an earor other suitable protection 36 carried by the actuating element |8. The construction of these A elements is such as to not. engage the projection 36.1vith link 35- until the `throttle valve has been openedto its widest vposition by means of link 2l. Further movement of the actuating-element.k

I8 which as aforesaid causes the throttle valve to Vtie moved towards its idling position.effects3 a moving of the choke valve lever 32 as the pro jection 36 engages link 35 and moves the samel into the position as shown in Fig- 7. It will be noted in Fig. 'Z that the chokevalve is com.-

pletely closed, the choke valve moving through.

`choke valve may be readily seen in comparing Figures 6 and 'l which show the beginning of the choke valve movement and the ending of the chokeV valve movement respectively, It will be noted that the lever 32 attached to the choke valve moves or rotates at a greater relative speed rthan the angular movement of the actuating element I8. 'Ihe closing movement of the choke valve is had while moving the throttle valve towards its idling position, and the adjustment of the throttle valve when the choke valve is` closed is such as to permitready starting of the engine. f

It wm be noted that the throtuvaive never` 23 is positively connected to the throttle valve and may be actuated by means of the foot accelerator independently of the choke valve operation, and by means of the hand device whenever desired by reason of the aforesaid connections which connect the throttle valve with the` ac,- tuating element I8.

Inthe construction"illustratedin Figs. 8 to l1 inclusive, I have shown amodied construction in which a lesser number of parts are employed and which is relatively simpler and more compact Vin construction. In this modified construction I have provided a motion multiplying device be-V tween and intermediate the actuating element and choke valve in which the choke valve is actuated by reason vof a shortened lever arm whereas in the construction illustrated-in Figs. 1 to 'l inf This kmotion multiplying elusive a toggle alim construction is employed for eeeting said multiplication of motion.

modified construction employs a throttle armlever 23 towhich the foot accelerator pedal is connected inthejusual way, said lever having an arm. 3.2 carrying a pin 3ft-adapted for sliding engagement in an arcuate slot 29' ,oi a'link 21. In these-triatlon of the throttle lever 23 by said foot. pedal the pin is free to move in the arcuate slot 29' without actuating the'link 2'l,- but movement .of the link2'l will actuate the lever 23 and effect an adjustment of the throttlevalve |4.

The operationvoiY this modied structureeects substantially thesame results as the operation ofjthestructure illustrated by Figs. 1 to 7 inclu-- sive, An'aetuating element 40 rotatively mounted on the choke valve shaft 20His employed, this element, having an arm 401 towhich the other end ot link. 21' is pivotally connected as at 4|. Ac-

tuation of said element 4|!l fromthe .positionv shown in Fig. 8 to that shownin Fig. 10 effects an adjustment of the throttle valve |4 without moving the choke valve as the link 2l is moved downwardly, but further movement of the element 40 engages'the edgeof link 21 with a pin 42 or other suitable pro-jectionarried ,by a member 43 fixed or otherwise secured to the choke valve shaft 20 and thus an actuation of the choke valve is obtained; The vrcontinued movement of the actuating element 40 raises the link 21 and thus moves the throttle valve towards the idling position while atthe same time closing the choke valve by'reason of the engagement of the link 21" with pin :420i member143.

It, will be noted that the lever arm for actuating the choke valve (the distance from pin 42 to the axis of the choke valve shaft) is less than the lever arm for actuating the throttle valve` shaft `(the'ciistance between pivot 4| and the axis or the choke valveshaft). Thus the linear movementof the link 21 induced by a definite angular movement of arm 40. from Fig. 10 to Fig. 1l position, causes substantially the same linear movement of pin42 but becauseof the fact that pin 42 carried by member 43 moves on a shorter radius, i. e.; it has a shorter lever arm, the member 43fixed to the choke valve shaft is moved through a'greater angle and thus eiects a complete closng of the choke valve (Fig. Vll) while the throttle valve has been only part way returned towards its idling position. The position of the carburetor valves shown on Fig. 11 may be termed the starting position, it being that position of the valves most desirable for starting the engine: Y i

`The actuating ,element is connected with the hand device I6 by means of a Bowden wire I1 in a. manner similar to the connection shown'in connection with Figs. 1 to 7 inclusive: The springs associated with the Vthrottle and choke valve shafts respectively urge the same to a closed and open position. The members 32 and 43 are respectively provided with arms 32 and 43' adapted for engagement with a suitable abutment 44 carried by the carburetor casing wherebyto limit the vchokefvalve movement.

Figs. l2 to 1'5 illustrate a further modified form of construction in which Vmovement of thehand device I6 in one continuous direction rst effects an adjustment of the throttle valve and then an adjustmentof the choke valveowhile at the same time reversing the movement of the throttle valve.

The throttle valve I4 is secured to shaft 9 and a throttlelever is fixed vor otherwise keyed to this shaft. accelerator pedal 24 by means of a bell crank or lever 25 and Bowden wire 2B. The lever 50 is provided with an arm 5| carrying a pin 52 adapted for engagement in an arcuate slot 53 carried by the link 54. Thus, the throttle valve may be moved in any desired adjusted position by means of the foo-t pedal without moving'link 54 by Vreason of the slotted connection between the pin 52 and link 54 (see Fig. 13).

Adjustment of the throttle and choke valve is had by means of the hand device actuation and associated connections. An actuating element 55 is connected with the hand device I6 by means of the Bowden wire and is rotatably mounted on the shaft 2||`to which is secured the choke valve I5. The element 55 is provided with one arm 56 to which the link 54 is pivotally con- A nected as at 51 and another arm 58 carrying a sition to Fig. 14 position and by reason of the link 54 connecting the arm 56 to the arm 5| of the throttle lever, the throttle valve |4-is thereby adjusted. During this initial adjustment'of the throttle valve, no movement is imparted'to the choke valve l5, but further movement of the hand device in the same direction moves the actuating element from Fig. 14 position to Fig. 15r

position, and the choke valve is moved to a closed position by reason of the engagement of projection 59 with the member B0. Simultaneous with the closing movement of the choke valve |5 the throttle valve is also moved towards its idling position but the upward movement of link 54 in moving from Fig. 14 position toFig. 15 position only moves said throttlevalve part way towards the idling position. l

The above described operation ismade possible'in the present instance by reason of the different lengths of lever arms, arm 5| being relatively longer than arm 5G so that the-linear travel of link 54 by reason of the angular movement of member 5B results in a relatively less angular movement of arm 5| to which the upper end of link 54 is attached.

In all three structuresv illustrated in the accompanying drawings, it will be noted that I have provided for operation of the throttle and choke valves of the carburetor by means of a single hand device, and can obtain an adjustment of the throttle valve independently of the choke valve operation during the rst part lof hand'device actuation while during the latter part of said hand device actuation an adjustment of said choke valve is obtained. Incidentally a partial closing of the throttle valve is obtained when closing the choke valve by means of the hand device, and on opening the choke to which my invention pertains that` various.

The lever 50 is connected with a foot modifications and changes may be made therein without departing from the spirit of my invention or from the scope of the appended claims.

What I claim as my invention is:

1. In a carburetor provided with a throttle valve, actuating means positively connected to the valve for operating the latter, means for operating said valve and including a hand device and an actuating element, the latter operatively connected with said actuating means to open said valve from an idling position and then to move same towards its idling position on movement of said hand device in the same direction, and a choke valve structure for the carburetor, including a shaft, a valve element and a lever secured to the shaft, said actuating element rotatably supported on said shaft and engageable with said lever to adjust the choke valve.

2. In a carburetor having a throttle Valve and a choke valve, throttle valve adjusting means, control means for said valves including a hand device and an actuating element operated by said hand device independently of said throttle valve adjusting means, actuating means connected with saidV element and operatively connected with the throttley valve for adjusting same on operating said hand device, said actuating means having a connection with said throttle valve permitting the adjustment of said throttle valve independently of said hand device operation, and

means operatively connecting said element with the choke valve and including motion multiplying devices operable only during the latter portion of the hand device operation for adjusting the choke valve.

3. In a carburetor provided with a throttle valve, means positively connected to the valve for operating the latter and including a throttle leverrand a link, means connecting said link and lever permitting actuation of the lever independently o f said link, a choke valve for said carburetor, and other valve operating means including a hand device and an actuating element positively connected with the hand device and with said link, means including a lost motion connection for connecting the actuating element with the choke valve, said throttle valve being adjusted during the rst part of the hand device operation, the latter part of said hand device operation engaging said element with the choke valve to adjust same subsequently to the initial adjustment of the throttle valve.

4. In a carburetor provided with a throttle valve, means positively connected to the valve ating means including a hand device and an` actuating element positively connected with the hand device, said actuating element connected withgsaid throttle valve operating means whereby to solely adjust said throttle valve during the rst part of the hand device operation, the latter part of said hand device operation engaging said element with the choke valve to adjust same while simultaneously eiecting a further actuation ofthe throttle lever and link whereby to further adjustsaid throttle valve.

5. In a carburetor provided with a throttle valve, lmeans positively connected to the valve for operating the latter, a choke valve for said carburetor, and other valve operating means including a hand device and an actuating element positively connected with the vhand device, said actuating element connected with said throttle valve operating means whereby to solely adjust said throttle valve during the rst part of the hand device operation, motion multiplying means connecting said element with the choke valve, ther latter part of said hand device operation actuating said last mentioned means whereby to move the choke valve to close same and actuating the connections intermediate the element and throttle valve to also move said throttle valve towards its idling position.

6. In a carburetor provided with a throttle valve, means positively connected to the valve for operating the latter, a chokervalve for said carburetor, and other valve operating means including a hand device and an actuating element positively connected with the hand device, said actuating element connected with said throttle Valve operating means whereby to solely adjust said throttle valve during the rst part of the hand device operation, means operatively connecting said element with the choke valve to close same during the latter part of said hand device operation and including motion multiplying means, said connections between the element and throttle valve being further actuated to move said throttle valve part way towards its idling position on closing said choke valve.

v HAROLD H. TIMIAN. 

